已知(x-y)/(x+y)=-1/2,则分式(x²+4xy+3y²)/(x²+2xy-3y
已知 3X-4y=0 求分式3x²-y²分之x²+2xy
3x+4y=0 x不等于0 求分式2xy+y²/x²-xy
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知1/x-1/y=3,求分式(2x+3xy-2y)/(x-2xy-y)
已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值
已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
两道分式数学题已知1/x+1/y=3 则 x+y+xy+2y²/2xy+y²=?已知x+1/x=3
已知分式x²+3分之x-2y的值为0,求分式x²-y²分之x²-3xy-4y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²